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Why does Java's hashCode() in String use 31 as a multiplier?
...erent meaning. Yes, that implies that Map.of(42, 42).hashCode() or Map.of("foo", "foo", "bar", "bar").hashCode(), etc, are predictably zero. So don’t use maps as keys for other maps…
– Holger
Aug 30 '19 at 9:12
...
add column to mysql table if it does not exist
... the error with a declare continue handler:
delimiter ;;
create procedure foo ()
begin
declare continue handler for 1060 begin end;
alter table atable add subscriber_surname varchar(64);
end;;
call foo();;
I think its neater this way than with an exists subquery. Especially if you have a ...
Update value of a nested dictionary of varying depth
...eplacing an element such as an integer with a dictionary, such as update({'foo':0},{'foo':{'bar':1}}). This update addresses it:
import collections
def update(d, u):
for k, v in u.iteritems():
if isinstance(d, collections.Mapping):
if isinstance(v, collections.Mapping):
...
How to .gitignore files recursively
...git 1.9.1 for ignoring all files except js in following case: (first line) foo/bar/*/* (second line) !foo/bar/**/*.js It worked only for one level of subdirectories, but not recursively.
– LLL
Mar 5 '19 at 19:40
...
What does in XML mean?
...characters
like > < " and &
or write things like
<foo></bar>
but my document is still well-formed!
-->
</exampleOfAComment>
... but it is still part of the document:
<exampleOfACDATA>
<)*[\s\S])/)[1];
return new Worker(window.URL.createObjectURL(
new Blob([str],{type:'text/javascript'})...
Parsing boolean values with argparse
...like to use argparse to parse boolean command-line arguments written as "--foo True" or "--foo False". For example:
20 Answ...
How can I add a class attribute to an HTML element generated by MVC's HTML Helpers?
...C#, you can prepend the property name with an at sign, @:
Html.BeginForm("Foo", "Bar", FormMethod.Post, new { @class = "myclass"})
For VB.NET this syntax would be accomplished using the dot, ., which in that language is default syntax for all anonymous types:
Html.BeginForm("Foo", "Bar", FormMet...
Localization of DisplayNameAttribute
...ceKey; // Fallback with the key name
}
Typical usage would be:
class Foo
{
[Common.DisplayNameLocalized(typeof(Resources.Resource), "CreationDateDisplayName"),
Common.DescriptionLocalized(typeof(Resources.Resource), "CreationDateDescription")]
public DateTime CreationDate
...